1. Two way to restore password file: Copy from anther diskgroup or change the location to new diskgroup.
-- Copy from anther diskgroup to old location diskgroup.
ASMCMD [+] > pwcopy --asm +FRA/my_pwfile_backup +DATA2/my_orapwasm

--change or set the location to new diskgroup.
ASMCMD [+] > pwset --asm +FRA/my_pwfile_backup